ATV 2/3 displaying cover art incorrectly

I love my ATV2, I have a MacMini hidden away in a cupboard running home sharing which stores all my music, films & tv shows. Everything is indexed to the nth degree, meta, tv episode IDs etc.. but one thing still needs addressing...

Cover art - all my films and tv shows have portrait cover art, this looks great on the iPhone, iPad but the ATV sometimes crops TV Shows to squares, sometimes to rectangles. I can't figure out why. Any ideas.

turns out TV shows are meant to be 600x600 to fit in with the current iTunes store specs.

Now,

How do you download high-res artwork from iTunes store for your files? The right-click thing just doesn't work. Can you beat this work process?

1) Find the item in the iTunes store
2) Copy and paste the link into Safari
3) Open the 175x175 cover art in a new window
4) Manaually change the 175x175 to 600x600 - refresh
5) Copy and paste the artwork into iTunes "get info - artwork" box for entire series.

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